Sharpening device for slicing machine knives



July 18, 1933. c. F. M. VAN BERKEL SHARPENING DEVICE FOR SLICING MACHINE KNIVES Filed Jan. l2, 1928 Patented July 178, 1933 v UNITED STATES PATENT OFFICE oORNiinis r.' iii. VAR RRRKRI., or WASSENAAR, NETHERLANDS, ASSIGNOR To U. s. SLIG- ING iviAciIiNn COMPANY, or LA ronrii, iNDIANA, A CORPORATION or INDIANA SHARPENG DEVICE FOIL SLICING`MACHINE KNIVES Application filed January 12, 1928, Serial' No.

This invention relates to devices for sharpening the rotary circular knives of slicing machines, and has for one of its objects the provfision of means for automatically removing the Sharpener from proximity to the knife edge after a sharpening operation.

Otherobjects and advantages will appear from lthe following description.

The invention is exemplilied inthe co1nbination and arrangement of parts shown in the accompanying drawing and described in the following specification, `and it is more particularly pointed out `in the appended claims. r i

In the drawing, the figure is an elevation, with parts in Section, showingone embodiment Vof the present invention. y

The numeral 1 designates a slicing'inachine knife journaled to rotate in the usual Way, a socket member 2 being mounted upon the support for the knife and having a post 3 carried therein. A slot 4; is formed in the upper end of the socket at one side thereof for receiving a lug 5 on the vpost 3 to hold the post against rotation in its Socket. At the upper end of the post'is abracket 6 having spaced bearings 'l' and 8 carriedthereon. A sleeve 9 is mounted inthe bearings 7 and 8 and is movable `in itsbearings in the direction of theaxis of the sleeve.v AShaft l() is v journaled in the sleeve 9 and supports a grinding memberlland finishing member 12 for engaging the opposite faces of the knife 1. Acollar 13is fixed to the sleeve 9 and Springs 11i and 15 are interposed between the collar 123 and the bearings `7` and 8, re` spectively. v The lsprings 14 and A15 and the collar `i3 are arranged to hold the sleeve 9 in such position that the grinders 11 and 12 are both spaced from the edge of the knife 1. A knob 16 is secured to the end of the sleeve 9 and the sleeve may be movedlongitudinal ly inv either direction by pressure on the knob V to bring either-,of the grinders 11 and 12 into engagement with the knife 1. y J

To sharpen the knife, the operator first presses on the knob 16 to bring the grinder 11 into engagement with the beveled side of the knife edge. After the knife has been 246,333, and in Germany January 28, 1927.

ground, the operator draws backwardly on the knob 16`t-O cause the grinder 12 to engage the straight side of the knife edge to remove any burr formed by the grinding process. Onrelease of the knob, the grinders automat* ically take their normal position at opposite sides of the knife edge and free from the edge. The entire Sharpener may now be rotated to inoperative position by raising the post 3 until the lug 5 clears the top of the Slot 4, It is necessary to raise the post a sufficient distance to cause the grinders to clear the knife before the Sharpener can be rotated to its inoperative position.

their the Sharpener is returned to its operative position, the springs 14 and 15 will insure that the grinders are properly spaced away from the plane of the knife so that when the Sharpener is lowered, neither of the grinders will Strike the edge of the knife. If no means were provided for automatically positioning the grinders, the Sleeve-9 and the parts attached thereto might move accidentally or by the force of gravity into a position such that when the Sharpener is returned to operative relation with the knife and lowered the grinder 11 would Strike the edge of the knife and thus injure the edge. The spring arrangement provides automatic means for preventing Such injury.

l. A Sharpener for slicing machine knives, the combination with two spaced-apart grindersadapted to'be located in spaced relation to opposite edges of the knife to be sharpened, -means connecting said grinders for Simultaneous bodily movement so that one of Said grinders is compelledto move toward the knife while the other is moving away from the knife and vice Versa, a sup port, means for mounting said grinders for movement relatively to said support into and out of engagement with the knife to be sharpened, an abutment, and springs between said Support and Said abutment for movino' said grinders automatically into their spaced relation with the knife and out of engagement therewith.

y 2. A sharpenerfor slicing machine knives, comprising a sleeve, a shaft journaled in said y predetermined positionrelative to the end- Wise movement of said sleeve and shaft together With said grinder mounted on said shaft, but permitting movement thereof longitudinally of said axis to either side of said fio predetermined position when manual pressure is applied thereto in the direction of said axis.

3. "A Sharpener for slicing machine knives, comprising a pair of spaced-apart grinders adapted to be spaced from the opposite edges of the knife to be sharpened, a sleeve, a shaft journaled `in said sleeve and rigidly connected to both of said grinders to move bodily therewith in the direction of the axis of the shaft and rotate with the shaft, means for conlining movement of the shaft to rotation relative tothe sleeve and preventing endWise movement relatively to said sleeve, a bifurcated bracket having bearings for said sleeve to permit endwise movement thereof together With said shaft and the grinders thereon, a knob connected to said sleeve for moving either grinder into engagement with the knifeto be sharpened,a collar abutment on said sleeve between said bearings of said bifurcated bracket, and springs between said abutment and the arms of said bracket for automatically restoring the grinders to their positions in spaced relation with the 'knife when said knob isreleased. i

4. A sharpener for slicing machine knives, comprising a vpair of co-axial grinders, one for engaging one side of the knifeedge to be sharpened and the other for engaging the other side thereof, manually operable means for moving either one or the other of said grinders into engagement With the knife edge, and automatic resilient mechanism for moving the grinders upon release of said manually operable means to positions at opposite sides of the knife and inspaced relation thereto. y .f f

, 5. Av Sharpener for slicing machine-knives, comprising two spaced-apart grinders -for the opposite sides of the cutting edge of the knife to be sharpened, means connecting said grinders for simultaneous bodily Amovement so that when one grinder approaches the knifethek other recedes therefrom, manually operable means for moving` either grinder into engagement With the knife and manual- 1y pressing the same into such engagement during the sharpening operation, and lautomatic spring'means concentric with the axis of rotation of said grinders for moving said grinders to positions in spaced relation with the knife when said manually operable means is released.

6. A Sharpener for slicing machine knives, comprising a grinder, a sleeve, a shaft journaled'in said sleeve and rigidly connected to said grinder to move bodily therewith in the direction of the axis of the shaft and rotate With the shaft, means for confining move- Ament of the shaft to rotation relatively to said sleeve and preventing endwise movement relatively to said sleeve, a bracket for slidably supporting said sleeve to permit end- Wise movement thereof` together With said shaft and the grinder thereon, a knob connected to said sleeve for moving said grinder into engagement With the knife to be sharpened, and means for automatically restoring the grinder to its position in spaced relation With the knife When the knob is released.

7. A sharpener for slicing machine knives, comprising a pair of spaced-apart grinders adapted to be spaced from opposite edges of the knife to be sharpened, means for supporting said grinders for rotation on a predetermined axis, a bearing for slidably supporting said supporting means,` a knob connected to said supporting means to slide the latter in said bearing to move one of said grinders into operative position, and means comprising springs associated With said supporting means. for automatically restoring the grinders to their positions in spaced relation with the knife when said knob is released.

8. A Sharpener for slicing machine knives comprising a shaft, a pair of grinders mounted directly on and held against longitudinal movement along said shaft relativevto each other and having'their operative surfaces in spaced relation to each other andadapted to lie on the opposite sides of the cutting edge of said slicingknife at the same time, a mounting for said shaft to permit longitudinal movement thereof to bring the operative faces of said grindersinto engagement with said knife and yielding means for normally holding both of said grinding faces away from said knife but permitting movement of said faces into engagement With said knife when manual pressure is exerted thereon in the properdirection.

9; grinder for slicing machine knives comprising a support, a shaft slidable longitudinally. on said support, means for moving said shaft longitudinally, grinders on said shaft having their operative faces spaced from each other on opposite sides of the slicing knife, manually operable means for movingl either of said grinders selectively into engagement with said knife, and yielding means for moving both of said grinders to inoperative ,position upon release of said manually operable means.

' 10. A grinding apparatus for slicing machine knives comprising a support, a sleeve mounted in said support, a collar on said sleeve, a shaft rotatable withinsaid sleeve but constrained to move longitudinally therewith, a pair of grinders carried by said shaft and having their operative faces spaced from each other and adapted to lie on opposite sides of the slicing knife, springs on the opposite sides of said collar adapted to engage said support and normallyl hold said sleeve in such a position that theV grinders are out of engagement `with thevknife, and manually operable means for moving either of said grinders into engagement with said knife,

said springs automatically moving said grinders to operative positions upon release of said manually operable means. v

l1. Sharpening apparatus comprising a support having spaced bearings, a sleeve Carried by said bearings and having a manually operable element secured thereto, a collar on said sleeve between said bearings, a spring between said collar and one of said bearings, a spring between said collar and the other of said bearings, said springs normally holding said sleeve in a predetermined position relative to said support, a spindle carried by said sleeve, and grinders carried by said spindle for sharpening a slicing machine knife, said grinders normally lying on opposite sides ofthe slicing yknife when said support is in its operative position and said grinders also being normally out of contact with said knife due to the action of said springs 'in holding said sleeve in a predetermined position on said support, and said grinders being also selectively movable into and out of engagement by said manually operable means secured to said sleeve.

CORNELIS F. M. VAN BERKEL. 

